Method of sealing metal container



Dec. 6, 1932. lsuNTE 1,890,193

METHQD OF SEALING METAL CONTAINERS Filed June 29. 1931 3nventor(lttornegs Patented Dec. 6,

v um'rsb STATES PATEI T OFFICE-.7

WILLIAM I. PUN'I'E, OF SYRACUSE, NEW XORK, ASSIGNOB T OONTINENTALCAH rm,me, on NEW YORK, N. 2.,

A CORPORATION OF NEW YORK un'rnon or SEALING METAL CONTAINER Applicationfiled June 29,

The invention relates to new and useful improvements in metalcontainers, and more particularly to the method of sealing metalcontainers. It has been a common expedient in the art to provide thebody portion of a metal container with a horizontally projecting flangeand the cover portion'for the containerwith a similar horizontallyprojecting flange, which overlies the flange on the body portion, toplace a sealing material between the flanges and secure the flanges by asealing strip which embraces both flanges. It is diflicult to obtain aproper seal in a container of this type and also to secure the sealinghand to the projecting flanges so that it will hold the flanges in tightsealing contact with in full lines the, cover in its normal condition.

and before it is applied to the container body, and in broken lines, thecover as applied to the container body but, before the sealing strip hasbeen attached for sealing the container; Fig. 3 is a view showing inbroken lines one way of applyinga sealing strip and in full lines theposition of the sealing strip when the container is sealed, and Fig. 4is a view showing the method of at taching a slightly different form ofsealing strip, and the sealing of the container.

The container includes a body portion indicated at 1' in the drawing.The body portion has one end thereof closed by a container end 2 whichis secured to the body portion-by 1931. Serial No. 547,734.

a double seam 3. Thebod portion at the other end thereof is provide witha flange 4. The container body is closed by a cover or end 5. having acentral depressed portion 6 which fits within the body portion. Saidcover also so has a projecting flange 7 which is curved so as to providea channel 8 on its under face. The cover is inverted and the channelfilled with a sealing material 9. After the sealing material is set, itis retained within the channel and the cover may be inverted and appliedto the container. The flange 4 has a horizontal face extendingsubstantially from the point 4 to thepoint 4P at the extreme outer edgeof the flange; The cover flan e is curved from the point 7 to the pointwhich forms the channel 8T0]: the'sealing material. The flange of thecover or end 5 when curved or in its normal condition, is of lessmaximum diameter than the flange i of the body, and therefore, when thecoveris inserted in the body, the extreme outer edge 7" of the cover orend will engage the flange 4 substantially at the point 4. After thecover has been placed on the container body,

.asealing strip 10 is applied to the cover.

The sealing strip 10, as shown in Fig. 3, has the side portions thereofarranged substantially at Eight angles to each other. Pressure is applieto the upper portion ofthe sealing strip so as to force the flange 7 ofthe cover into a horizontal position. This will squeeze the sealingmaterial outward and inward, thus making a very tight seal between thetwo flanges. The under sideportion 11 of the I sealing strip is thenforced underneath the lower flange so as to tightly grip and hold theflanges in parallel relation, after the pressure has been relieved fromthe upper face of the sealing strip. The sealingstrip is gripped by 85the tendency of the curved-flange to spring back to its curvedcondition, and this will hold the sealing strip firmly connected to theparallel projecting flanges. The sealing strip also will hold the flange7 in its horizontal 9Q position, pressing against the sealing material,and thus forming a very tight sea In Fig. 4 of the drawing, a slightlydifferent method of attaching a sealing strip to b the flanges of thecontainer is shown. In this form of the invention, the sealing strip issubstantially V-shape in cross section, and isrolled into hook fornf,and then laced around the flanges of the can body an the can end orcover. The can body with the cover placed thereon with the sealing stripin place, is positioned in the lower die ring 13. The upper die ring 14is lowered, and the portion 14' thereof brought into contact with thesealing strip. The relative movement of the die. rings will force theupper and lower portions of the sealing strip 'into contact with theflanges, and will straighten the curved flange on the cover,

on the cover, when curved being of less diameter than the flange-on thecontainer body, so as to rest thereon when the cover is applied to thecontainer body, placing a lastic sealing material in the channel and t ecover on the container bod and sealing the container by applyin a seastrip thereto which embraces the anges d rid forces the curved flange onthe cover into parallelism with the horizontal flange on the containerbody. w

In testimony whereof, I aflix my signature.

. WILLIAM F. PUNTE.

bringing said flanges and the sealing 'stripinto the position shown infull lines in Fig. 3. The same tight grip of the'sealing strip on theflanges is obtained, and the same tight sealing ofthe container rodueed.

It is obvious otherwise applied to the container. The essential feature,however, of the method consists in the curving of the flange on the endto form a channel or pocket for the sealing material, and the forming ofthe flange on the body substantially horizontal, so that it willcooperate with the sealing strip, when applied, to straighten out theflange on the cover or can' end, and thus press the sealing materialinto intimate contact with the parts, producing a closure which is notonly a tighty sealed closure, but one which may be readi-' ly opened bya horizontal force applied in an outward direction on the sealing strip.

Hav ng thus described the invention, what I claim as new and desire tosecure by Letters Patent, is-

1. The method of forming an hermeticall sealed metal container mg thecontainer body with an outwardly ex- 45 tending substantially horizontalflange and a cover for the container with a penpheral flange adapted tooverlie the flange on the body and normally curved upwardly between themner and outer edges of the fla 50 form a channel on the under. facethereof placing a (plastic sealing material in' said channel an thecover on the container body, and sealin mg strip t ereto which em racesthe fl and forces the curved flange on the cover into parallelism withthe horizontal flange on the container-body,

2. The meth'odcf forming anhermeticall sealed metal'container consistingin pmvi ing the container body with an outwardly extending substantiallyhorizontal flange, and a cover for the container with a peripheralflange normally curved upwardly between the r. innetegnd outer ed of theform a channel oi the an or face thereo saidflange at the sealing stripmaybe to v the container b applying a seal- Ice consisting in provi IIII

